It's been a busy couple of days at the Eventim Apollo theatre in London with rehearsals and press interviews but tonight the Eurovision Song Contest's Greatest Hits will be recorded ahead of being broadcast from Friday onwards in many countries across the continent.

In the build up to the 2015 Eurovision Song Contest in Vienna, several preview party events will be taking place across Europe, where a number of artists from this year's contest will be performing, along with former winners and participants. Here is your guide to the main events, and if you are lucky you may be able to get tickets to some of them before the are sold out.

Genealogy will represent Armenia this year, a "global" group of famous singers from five different continents who are all true to their Armenian roots. Watch our video feature, check out our brand new photo gallery and get to know the six artists in depth!

John Karayiannis will be representing Cyprus in the Second Semi-Final of the 2015 Eurovision Song Contest with the Mike Connaris composition One Thing I Should Have Done. He recently took time out his busy schedule to record a short video interview, which you can watch on Eurovision.tv

Guitarist Jørgen Ingmann passed away yesterday, the 21st of March 2015, at the age of 89. He will be most remembered in the Eurovision family for having won the Song Contest on behalf of Denmark in 1963 alongside his wife back then, Grethe, and the song Dansevise.